Reversing-gear.



R. N. SMITH. BEVERSING GEAR. APPLIOA'I'ION nun) JUNE 12,1908.

Patented Aug. 3, 1909.

INVENTOR 1 1511063711.

WIT NE 8859: JM/M PATENT OFFICE.

RUSSELL N. SMITH, or ALMA, WISCONSIN.

REVEBSIiiG-GEAR.

Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed June f2, 1808. Serial No. 488,186.

To all whom it may concern lie it known that I, Russau. N. SMITH, residing at Alma, in the county of Buffalo and State of \Vlsconsin, have invented certain new and useful Improvements in Reversing-Gear, of which the following is a specification.

My invention relates to certain new and useful improvements in devices for reversing gas engines and the like, and in its generic nature the invention embodies an improved means for reversing a four-cycle as engine, operating in conjunction with tile exhaust valve of the engine whereby the valve may be arranged to opeh at different predetermined times to cause the engine to run either in one ,rlirizetion or the other.

More specifically my improved reversing mechanism comprises a sleeve longitudinally movable and partly rotatable on the reversing valve cam shaft, u )on which sleeve the gear that meshes with the engine drive shaft gear is keyed, the sleeve having a longi- 5 tudinal movement throu h the gear so that 2,

wh'en the sleeve is'move longitudinally in one direction the cam shaft will be turned in onedirection a predetermined distance I with relation to the gear to cause the earns to operate the exhaust valve at a certain time to permitthe engine to run in one direction, and when the sleeve is shifted in an op )osite direction the cams will operate the ox must valve at a difl'erent time to permit .the engine to run in an op ositc direction.

Those other novel detai s of construction, combination and arrangement of parts which will be hereinafter described and specifically pointed out in the appended c aim also constitute a part of my invention. 9 Referrin now to the drawings, it will he seen,- figure 1, is a central longitudinal section of a gas engine embed ing my invention. Fig. 2 is a central ongitudinal cross section at right an Ice to Fi 1. Fig. 3 is a detail view of e shifta le sleeve. 1* lg. 4, is a diagrammatic view showing the position of parts when the engine is arranged to run'in one direction. Fi 5, 1s

"' a similar view showing the osition 0 parts when the engine is reverse Referring now to the accom anying drawings, in which like letters an numerals of re erencc indicate like parts mall of the figures, 1 represents the engine, which may he of anyapprovcd construction of the fourflVhe-n the slot 4", the s eeve QR ill not be susceptible cycle type, and in which 2 represents the crank or drive shaft which carries the gear "2 to mesh with the cam shaft ear 8 that is mounted on the sleeve 4 and eyed to turn therewith by a key 4, as shown, the sleeve 4 being longitudinal] slidable on thecam shaft 3 and susceptible of a limited rotary movement onsuch shaft. The sleeve 4 has two slots 4 terminatin in parallel ended", the slots 4' being spiral arranged so that us the sleeve 4 18 move longitudinall it will receive a rotary movement on the Slflft 3, a pin 3" being carried by the shaft 3 and operatin in the slots 4'. The sleeve 4 also has a c ntch lever receiving groove 4* in which the anti-friction rollers 5" of the fork 5" of the shifting lever 5 o erate,-,the shift ing lever 5 bein fulcrume at 5 to a fixed part of them me, so that it can betrnoved to shift the s eeve 4. Any suitable-gage mechanism mag be )rovided to hold t e lever 5 in its a juste positions. in 3 r. n

the end 4 of the of rotation on the siaft 3 and hence this )osition of the pin will ordinarily be sirflicient to prevent longitudinal dis lacement of the sleeve and the locking me anism for the lever 5 may. not, in practice, be

necessary.

The cam shaft 3 carries the cam 8 which cooperates with the arm 7 that engages the roller 8' of tho. valve rod 8 which operates.

the exhaust valve of the engine. In order to hold the gear 3" from longitudinal movement with respect shaft 2 may be rovided with a pair of disks 9-19 of slight y larger diameter than the ear 2 so as to embrace the gear 8', as shown in Fig. 2 of the drawings and hence prevent sidewlse movement of the gear 8., as the sleeve 4 i's-shifted.

In the practical application of my imvention, when the sleeve 4 is atone hm t of Kim longitudinal movement, say, in the position shown in Fig. 4, the cams 8 will 0 suite the to the shaft 8 the crank exhaust valve at such a time that t 9 engine will rotate in one direction, it, of course, being an sparking to c expl e the mixture at the proper time, do-

nding upon the direction 0 rotation of ills crank shaft. npposing the engmeto be running fg wa ly, my are in the posit on shownin such Fig. 4 and devices (not shown) are provided lode the mixture and these are set to" when the parts derstood that the usual timer and lot erate in a tlll't' llhll reverse in that ahnvrn in- Fig. t. Any means may he n-uvitletl fur shifting the timer and advancing and r1 tarding the span-la as such per 80, form no part of in) prim-ht inaentiun. Slmnlil the fun'ra-yele engine he provided with a. positirt-ly operated inlet valve, the same niei'h- :tltifilll may he (.ltlPllP-libtl to operate the inlet val e as: I] am aware that; some types of one cycle engines are prevideil with positively fllltil'illflt'l inlet. valve.

\Vhile I have described my invention as heing particularly adapted fur use in nun neetton with fmnrmycrlc gas engines, the same'may be used also in r-(inneetion with ether tiyp'c of gas engine in which a positively operated valve meeha-nisni is a part.

ri-aa; the rm-(going rl'ese'ription taken in al inement UHIlHLt'llUll with the aim-0|npanying drawings it is thought the (ximplete construction, 01) eratiun and advantages of my invention. will be readily nndersttmtt by those skilled in the art to whieh the invention appert-ainr-s.

What, 1. claim is:

in a reversing gear naaalianisni the eomhi nalinn with a rain sshai't and a crank shaft, a gen 1' sewn-ml to the rrank shaft to 1 arm therewith, a sleeve lmwitnilinally i'nurable 0a the rain shaft, said a euro having a spiral slat. terlninatilig in portions parallel to the ram shaft, a pin projecting through said slot and said eain shaft to came said sleeve and said shaft 10 turn. in unison, said. sleeve having; a gruove, a lever eoiiperatin with said groove, a roller carried by said ever to enter said greoie to shift said sleeve longit-mlinally on said 0am shaft. when the lever is moved, a gear penetrated by said sleeve and keyed thereto, one of said gears having side disks to emhrare the other gear to maintain their at. all times, substantially as shown and for the )IIIPOSBS described.

11 TSSELL N. SMITH. Witnesses J. S. MGCAmc, Jmm 'IIARRY. 

